A 4-Element Passive-Beamforming CT- ΔΣ ADC for Spatial Selectivity in Automotive Radar
This work demonstrates the benefit of spatial selectivity that a 4-element passive-beamforming continuous-time ADC can offer for the extreme dynamic range requirements in automotive radar. The beamforming-ADC is implemented in 40nm CMOS by R2R-based vector modulators as feed-in coefficients in combination with low-power implementations of a 4th-order inverter-based loop-filter, 4-bit asynchronous SAR-based quantizer and 4-bit current-steering feedback DACs. This work obtains >30dB of interferer suppression when deep notches are formed to obtain an effective spatial blocker dynamic range of 73.1dB. With notch-smoothing, the versatility to reduce the peak-to-notch-depth to 8dB for channel equalization is demonstrated. The beamforming-ADC consumes 7.3mW.
Authors
- Georgi Radulov (ORCID: https://orcid.org/0000-0002-0746-7928)
- Qilong Liu (ORCID: https://orcid.org/0000-0001-7560-6785)
- R. Schalk
- M. Neofytou
- Zhongbo Zhu (ORCID: https://orcid.org/0000-0003-1505-4880)
- Lucien J. Breems (ORCID: https://orcid.org/0000-0001-6984-4162)
- Shagun Bajoria (ORCID: https://orcid.org/0000-0002-0732-6578)
- Patrick van Mourik
Institutions
- NXP (Netherlands) (NL)
- Eindhoven University of Technology (NL)
Publication Details
- Journal
- IEEE Transactions on Circuits and Systems I Regular Papers
- Published
- 2025-05-06
- DOI
- https://doi.org/10.1109/tcsi.2025.3561950
- Citations
- 1
- Primary Topic
- Analog and Mixed-Signal Circuit Design
- Type
- article
- Field-Weighted Citation Impact
- 0.67
Funders
- Technische Universiteit Eindhoven